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(11) | EP 0 240 891 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Safety device for connecting a tire valve to a pressure detector of onboard maximum and minimum pressure signal relay systems |
| (57) This safety device is arranged between the tire valve of a motor vehicle and the
pressure detector of onboard maximum and minimum pressure signal relay systems and
allows normal operation of the tire valve in case of breakage or of damage to the
connecting tube of the pressure detector or the pressure detector itself. To this
end, the safety device comprises a first connecting portion including a ring nut (22)
to be screwed onto the tire valve (21) and a second connecting portion (37) having
a coupling member (39) for connection to the connecting tube (12) of the pressure
detector. The ring nut (22) has a rigid hollow pusher rod (23) engaging the stem portion
of the tire valve (21) and a sealing disk (31) accommodated in a chamber (30) of the
ring nut and freely movable between two extreme positions for airflow passage and
cutoff. The second connecting portion (37) is sealingly coupled to the first connecting
portion in a rotatable and axially slidable way and acts on a pusher stem (42) which
engages the sealing disk (31) to shift it from the cutoff to an air passage position
for set-up and/or restoring pneumatic connection between the tire valve and the pressure
detector. |